GH-131372: only install build-details.json in the main install (#142269)

* GH-131372: only install build-details.json in the main install

Signed-off-by: Filipe Laíns <lains@riseup.net>

* Add news

Signed-off-by: Filipe Laíns <lains@riseup.net>

---------

Signed-off-by: Filipe Laíns <lains@riseup.net>

Author: FFY00

Makefile.pre.in

@@ -2374,8 +2374,10 @@ multissltest: all
 # prevent race conditions with PGO builds. PGO builds use recursive make,
 # which can lead to two parallel `./python setup.py build` processes that
 # step on each others toes.
+# Only the main install gets a build-details.json.
 .PHONY: install
 install: @FRAMEWORKINSTALLFIRST@ @INSTALLTARGETS@ @FRAMEWORKINSTALLLAST@
+	$(INSTALL_DATA) `cat pybuilddir.txt`/build-details.json $(DESTDIR)$(LIBDEST); \
 	if test "x$(ENSUREPIP)" != "xno"  ; then \
 		case $(ENSUREPIP) in \
 			upgrade) ensurepip="--upgrade" ;; \
@@ -2828,7 +2830,6 @@ libinstall:	all $(srcdir)/Modules/xxmodule.c
 	done
 	$(INSTALL_DATA) `cat pybuilddir.txt`/_sysconfigdata_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH).py $(DESTDIR)$(LIBDEST); \
 	$(INSTALL_DATA) `cat pybuilddir.txt`/_sysconfig_vars_$(ABIFLAGS)_$(MACHDEP)_$(MULTIARCH).json $(DESTDIR)$(LIBDEST); \
-	$(INSTALL_DATA) `cat pybuilddir.txt`/build-details.json $(DESTDIR)$(LIBDEST); \
 	$(INSTALL_DATA) `cat pybuilddir.txt`/_missing_stdlib_info.py $(DESTDIR)$(LIBDEST); \
 	$(INSTALL_DATA) $(srcdir)/LICENSE $(DESTDIR)$(LIBDEST)/LICENSE.txt
 	@ # If app store compliance has been configured, apply the patch to the

Misc/NEWS.d/next/Build/2025-12-04-20-57-15.gh-issue-131372.o397g7.rst

@@ -0,0 +1,2 @@
+``build-details.py`` will only be installed as part of the main install
+(``make install``). ``make altinstall`` will no longer include it.